package top.kaoshanji.p1ch12d;

/**
 * 代码清单-p1ch12d-131页a：抽象主题
 * @author kaoshanji
 * ^_^
 * create time 2025/3/22 18:44
 */
public interface Subject {

    // 业务操作
    public void doSomething(String str);

}
